To implement network collaboration tools in ns3, we need to simulate a network that supports collaborative applications such as video conferencing, file sharing, and real-time messaging. For setting up the network collaboration in ns3 we have to generate traffic for different collaborative applications, and should monitor the performance. Below given steps will guide on how to implement network collaboration tools in ns3.
Step-by-step guide to implement network collaboration in ns3:
Step 1: Setup ns3 Environment
Make sure ns3 is installed on the system.
Step 2: Include Necessary Modules
Include the necessary ns3 modules in the script:
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/applications-module.h”
#include “ns3/flow-monitor-module.h”
Step 3: Create the Simulation Script
- Setup Nodes and Network:
using namespace ns3;
NS_LOG_COMPONENT_DEFINE (“NetworkCollaborationToolsExample”);
class VideoStreamingApplication : public Application
{
public:
VideoStreamingApplication ();
virtual ~VideoStreamingApplication ();
void Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate);
private:
virtual void StartApplication (void);
virtual void StopApplication (void);
void ScheduleTx (void);
void SendPacket (void);
Ptr<Socket> m_socket;
Address m_peer;
uint32_t m_packetSize;
uint32_t m_nPackets;
DataRate m_dataRate;
EventId m_sendEvent;
bool m_running;
uint32_t m_packetsSent;
};
VideoStreamingApplication::VideoStreamingApplication ()
: m_socket (0),
m_peer (),
m_packetSize (0),
m_nPackets (0),
m_dataRate (0),
m_sendEvent (),
m_running (false),
m_packetsSent (0)
{
}
VideoStreamingApplication::~VideoStreamingApplication ()
{
m_socket = 0;
}
void
VideoStreamingApplication::Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate)
{
m_socket = socket;
m_peer = address;
m_packetSize = packetSize;
m_nPackets = nPackets;
m_dataRate = dataRate;
}
void
VideoStreamingApplication::StartApplication (void)
{
m_running = true;
m_packetsSent = 0;
m_socket->Bind ();
m_socket->Connect (m_peer);
SendPacket ();
}
void
VideoStreamingApplication::StopApplication (void)
{
m_running = false;
if (m_sendEvent.IsRunning ())
{
Simulator::Cancel (m_sendEvent);
}
if (m_socket)
{
m_socket->Close ();
}
}
void
VideoStreamingApplication::SendPacket (void)
{
Ptr<Packet> packet = Create<Packet> (m_packetSize);
m_socket->Send (packet);
if (++m_packetsSent < m_nPackets)
{
ScheduleTx ();
}
}
void
VideoStreamingApplication::ScheduleTx (void)
{
if (m_running)
{
Time tNext (Seconds (m_packetSize * 8 / static_cast<double> (m_dataRate.GetBitRate ())));
m_sendEvent = Simulator::Schedule (tNext, &VideoStreamingApplication::SendPacket, this);
}
}
class FileTransferApplication : public Application
{
public:
FileTransferApplication ();
virtual ~FileTransferApplication ();
void Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate);
private:
virtual void StartApplication (void);
virtual void StopApplication (void);
void ScheduleTx (void);
void SendPacket (void);
Ptr<Socket> m_socket;
Address m_peer;
uint32_t m_packetSize;
uint32_t m_nPackets;
DataRate m_dataRate;
EventId m_sendEvent;
bool m_running;
uint32_t m_packetsSent;
};
FileTransferApplication::FileTransferApplication ()
: m_socket (0),
m_peer (),
m_packetSize (0),
m_nPackets (0),
m_dataRate (0),
m_sendEvent (),
m_running (false),
m_packetsSent (0)
{
}
FileTransferApplication::~FileTransferApplication ()
{
m_socket = 0;
}
void
FileTransferApplication::Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate)
{
m_socket = socket;
m_peer = address;
m_packetSize = packetSize;
m_nPackets = nPackets;
m_dataRate = dataRate;
}
void
FileTransferApplication::StartApplication (void)
{
m_running = true;
m_packetsSent = 0;
m_socket->Bind ();
m_socket->Connect (m_peer);
SendPacket ();
}
void
FileTransferApplication::StopApplication (void)
{
m_running = false;
if (m_sendEvent.IsRunning ())
{
Simulator::Cancel (m_sendEvent);
}
if (m_socket)
{
m_socket->Close ();
}
}
void
FileTransferApplication::SendPacket (void)
{
Ptr<Packet> packet = Create<Packet> (m_packetSize);
m_socket->Send (packet);
if (++m_packetsSent < m_nPackets)
{
ScheduleTx ();
}
}
void
FileTransferApplication::ScheduleTx (void)
{
if (m_running)
{
Time tNext (Seconds (m_packetSize * 8 / static_cast<double> (m_dataRate.GetBitRate ())));
m_sendEvent = Simulator::Schedule (tNext, &FileTransferApplication::SendPacket, this);
}
}
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
// Create nodes
NodeContainer nodes;
nodes.Create (6);
// Create point-to-point links
PointToPointHelper pointToPoint;
pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“100Mbps”));
pointToPoint.SetChannelAttribute (“Delay”, StringValue (“1ms”));
NetDeviceContainer devices;
devices = pointToPoint.Install (NodeContainer (nodes.Get (0), nodes.Get (1)));
devices.Add (pointToPoint.Install (NodeContainer (nodes.Get (1), nodes.Get (2))));
devices.Add (pointToPoint.Install (NodeContainer (nodes.Get (2), nodes.Get (3))));
devices.Add (pointToPoint.Install (NodeContainer (nodes.Get (3), nodes.Get (4))));
devices.Add (pointToPoint.Install (NodeContainer (nodes.Get (4), nodes.Get (5))));
// Install Internet stack
InternetStackHelper stack;
stack.Install (nodes);
// Assign IP addresses
Ipv4AddressHelper address;
address.SetBase (“10.1.1.0”, “255.255.255.0”);
Ipv4InterfaceContainer interfaces = address.Assign (devices);
// Set up applications
uint16_t videoPort = 5000;
uint16_t filePort = 6000;
// Video server on node 5
Address videoServerAddress (InetSocketAddress (Ipv4Address::GetAny (), videoPort));
PacketSinkHelper videoSinkHelper (“ns3::UdpSocketFactory”, videoServerAddress);
ApplicationContainer videoSinkApps = videoSinkHelper.Install (nodes.Get (5));
videoSinkApps.Start (Seconds (1.0));
videoSinkApps.Stop (Seconds (20.0));
// Video client on node 0
Ptr<Socket> videoSource = Socket::CreateSocket (nodes.Get (0), UdpSocketFactory::GetTypeId ());
Address videoRemoteAddress (InetSocketAddress (interfaces.GetAddress (5), videoPort));
Ptr<VideoStreamingApplication> videoApp = CreateObject<VideoStreamingApplication> ();
videoApp->Setup (videoSource, videoRemoteAddress, 2048, 10000, DataRate (“20Mbps”));
nodes.Get (0)->AddApplication (videoApp);
videoApp->SetStartTime (Seconds (2.0));
videoApp->SetStopTime (Seconds (20.0));
// File server on node 4
Address fileServerAddress (InetSocketAddress (Ipv4Address::GetAny (), filePort));
PacketSinkHelper fileSinkHelper (“ns3::TcpSocketFactory”, fileServerAddress);
ApplicationContainer fileSinkApps = fileSinkHelper.Install (nodes.Get (4));
fileSinkApps.Start (Seconds (1.0));
fileSinkApps.Stop (Seconds (20.0));
// File client on node 2
Ptr<Socket> fileSource = Socket::CreateSocket (nodes.Get (2), TcpSocketFactory::GetTypeId ());
Address fileRemoteAddress (InetSocketAddress (interfaces.GetAddress (4), filePort));
Ptr<FileTransferApplication> fileApp = CreateObject<FileTransferApplication> ();
fileApp->Setup (fileSource, fileRemoteAddress, 4096, 5000, DataRate (“50Mbps”));
nodes.Get (2)->AddApplication (fileApp);
fileApp->SetStartTime (Seconds (3.0));
fileApp->SetStopTime (Seconds (20.0));
Simulator::Stop (Seconds (20.0));
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
Step 4: Run the Simulation
Compile and run your simulation script:
sh
./waf configure
./waf build
./waf –run NetworkCollaborationToolsExample
Explanation
- Node Creation: Create nodes representing different devices in the network.
- Point-to-Point Links: Configure point-to-point links between nodes with high data rates and low latency to simulate a collaborative environment.
- Internet Stack: Install the Internet stack on all nodes.
- IP Configuration: Assign IP addresses to the interfaces.
- Applications: Implement custom applications (VideoStreamingApplication and FileTransferApplication) that simulate video streaming and file transfer traffic.
- Traffic Generation: Use the custom applications to generate traffic from client nodes to server nodes, simulating a collaborative environment.
Advanced Collaboration Techniques
- Real-Time Messaging:
Implement a real-time messaging application to simulate text-based communication.
class MessagingApplication : public Application
{
public:
MessagingApplication ();
virtual ~MessagingApplication ();
void Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate);
private:
virtual void StartApplication (void);
virtual void StopApplication (void);
void ScheduleTx (void);
void SendPacket (void);
Ptr<Socket> m_socket;
Address m_peer;
uint32_t m_packetSize;
uint32_t m_nPackets;
DataRate m_dataRate;
EventId m_sendEvent;
bool m_running;
uint32_t m_packetsSent;
};
// Implement the methods similar to VideoStreamingApplication and FileTransferApplication
- Quality of Service (QoS):
Implement QoS mechanisms to prioritize traffic for different collaboration tools.
TrafficControlHelper tch;
tch.SetRootQueueDisc (“ns3::FqCoDelQueueDisc”);
tch.Install (devices);
- Monitoring Performance:
Use the FlowMonitor module to analyze the performance of different collaborative tools.
FlowMonitorHelper flowmon;
Ptr<FlowMonitor> monitor = flowmon.InstallAll ();
// At the end of the simulation
monitor->SerializeToXmlFile (“collaboration-tools-flowmon-results.xml”, true, true);
- Simulating Packet Loss and Delay:
Introduce packet loss and delay to simulate real-world network conditions.
Ptr<RateErrorModel> em = CreateObject<RateErrorModel> ();
em->SetAttribute (“ErrorRate”, DoubleValue (0.01)); // 1% packet loss
devices.Get (1)->SetReceiveErrorModel (em)
// Introduce delay
Config::SetDefault (“ns3::PointToPointChannel::Delay”, StringValue (“10ms”));
- Simulating Multiple Streams:
Add multiple client applications to simulate a more complex collaborative environment.
Ptr<Socket> videoSource2 = Socket::CreateSocket (nodes.Get (1), UdpSocketFactory::GetTypeId ());
Ptr<VideoStreamingApplication>videoApp2 = CreateObject<VideoStreamingApplication> ();
videoApp2->Setup (videoSource2, videoRemoteAddress, 2048, 10000, DataRate (“20Mbps”));
nodes.Get (1)->AddApplication (videoApp2);
videoApp2->SetStartTime (Seconds (2.0));
videoApp2->SetStopTime (Seconds (20.0));
Finally, we all get to know how to implement network collaboration tools in ns3 by using the supporting collaborative applications. And also we have explained about the advanced collaboration techniques like real-time messaging, Quality of service, Monitoring performance, simulating packet loss and delay and simulating multiple streams.
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